Electric fuse



E. PARRADEE.

ELECTRIC FUSE. APPLlCATION FILED NOV. 3, 1919.

' Patented Mar; 28,1922.

2] nmmto'u fdward T'arraclee,

Swarm QUNITED. STATES PATENT OFFICE,

EDWARD PARRADEE, 0F GRAND RAPIDS, MICHIGAN.

ELECTRIC n sE;

' application filed November 3,1919. "ser al To all whom it may concern I Be it known that I, *DWARD PARRADEE, a citizen of the United States, residing at Grand Rapids, in the county of Kent and State of Michigan, have invented certain new and useful Improvements in Electric Fuses, of which the following is a tion. v

' My invention relates to improvements in electric fuses, and. its objects are: first, to provide a fuse in which the fusible element may be readily replaced without the necessity of inserting an entirely new fuse; sec 0nd, to provide a fusefrom which the fusible element may be removed and replaced at a any and all times and under all normal circumstances.

I attain these objects by the construction and arrangement of parts shown in the accompanying drawing, in which Fig. 1 is an elevation of my fuse detached from its support, and, Fig. 2-is a longitudinal transverse section of the same.

Similar reference characters indicate similar :parts throughout 7 the several views.

In the drawing 1 represents the core of the fuse, which, of course, must be made of some dielectric substance, as wood pulp, asbestos, or kindred substance. The outer surface of this core is screw threaded, as indicated at 9, for the safe retention of the cap 3, and for properly securing it into itssupporting element, in the usual manner. I form a passageway 7 through the core longitudinally, and a short slot 10 in one side for the reception of the fusible element 4 and of the terminal 6, which are applied in the following manner, to wit: I place a metallic terminal 5 upon, and pass it into one end of the coreand pass the fusible element through the said passageway and connect the end of the fusible element 4 with this terminal by passing the end of the fusible element under the edge of the terminal and in close contact therewith, as indicated at 5, where it is held, first, by the pressure of the terminal upon the fusible element and the end of the core, and, second, by the proper length to form. a close bearing upon the end of the core, and the end 4 is so positioned that it may be made to contact with the end of the terminal 6, substantially as Specification of Letters Patent.

specifica- Patented Manes, 1922. No. 335,551. I

shown. "The terminal 6 is securedto the core by being'so closely fittedinto the slot 10 as to holdsaid terminal firmly in place,-and the end of this terminal is bent at a right angle across the end of the core in such a manner that when the cap 3 is screwed into place, the end of the fusible element 4 will be made to contact the end of the terminal 6. To complete the electric circuit the screw threads 9, upon the periphery of the case 1, are covered with a thin layer of metal 2, and the terminal 6 is connected with this metal by placing the end of the terminal between the metal and the case 1 to contact the metal, as at 2'. It is, also, to be understood that the cap 3 must be made of some dielectric substance. I have formed a prominence or bilge at 8, on the inner surface of the head inbefore stated.

If the fuse is burned out, only the fusible element 4 is destroyed, and to renew it it is only necessary to remove the cap 3 and the remnantsof the fusible element, 4 and replace it by passing another like fusible strip through the passageway 7 and connecting it with the terminals as hereinbefore described. process of repair may be carried onindefinitely, or until the entire structurehas be come so far worn out as to be incapable of further repair. 7

Having thus fully described my invention, what I-claim as new in the art, is:

1. I11 an electric fuse, a dielectric core having a passage way through it at one side from its center and a slot in one side at one end, a terminal mounted in said slot and having one end bent at a right angle and extended across the end of the core, a'metal jacket covering the periphery of the core at the other end, said jacket electrically conneted with the body of the terminal, a second terminal secured in the end of the core 0pposite the angled end of the first terminal,

a fusible element passed through the passageway and electrically connected with the two terminals, a dielectric cap screwed upon one end of the core and having a bilge therein in position to press upon the end of the fusible element and contact it with the end of the adjacent terminal.

2. In an electric fuse, a dielectric core having a passage way through it at one side of its center, also having a slot in one side at one end, a screw thread formed upon the periphery of the core, a metallic jacket closel fitted into the screw threads at one end of the core a terminal of bendable material mounted in the slot in the side of the core with one end electrically connected with the metal jacket and the other endextended along; the side of the core and bent across the end thereof, a second terminal centrally lo cated at the other end of the core, a fusible element passed through the passageway in the core and electrically connected with the two terminals, a dielectric cap screwed upon the end of the core over the first mentioned 1 

